Stanley Chiang

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Dig through SERVFAILs with EDE

Dig through SERVFAILs with EDE
Dig through SERVFAILs with EDE

It can be frustrating to get errors (SERVFAIL response codes) returned from your DNS queries. It can be even more frustrating if you don’t get enough information to understand why the error is occurring or what to do next. That’s why back in 2020, we launched support for Extended DNS Error (EDE) Codes to 1.1.1.1.

As a quick refresher, EDE codes are a proposed IETF standard enabled by the Extension Mechanisms for DNS (EDNS) spec. The codes return extra information about DNS or DNSSEC issues without touching the RCODE so that debugging is easier.

Now we’re happy to announce we will return more error code types and include additional helpful information to further improve your debugging experience. Let’s run through some examples of how these error codes can help you better understand the issues you may face.

To try for yourself, you’ll need to run the dig or kdig command in the terminal. For dig, please ensure you have v9.11.20 or above. If you are on macOS 12.1, by default you only have dig 9.10.6. Install an updated version of BIND to fix that.

Let’s start with the output of an example Continue reading